The way to tell whether an idea is good is to see if it makes you feel like writing about it. There are no other criteria. I know that sounds trite. But it's true. Many people have great-sounding ideas for books but never write them. That means they are bad. The ideas, not the people. The people are probably bad, too. If an idea can't clear the first hurdle in a marathon, a marathon that has hurdles in it, then it's a bad idea. It is as bad as the idea of having a marathon with hurdles in it. You may study further and make the mistakes and, of course, work on them. However, I may suggest to go to "Marvelous Essay" service and check how you may get the help there.